Symptoms

Breast cysts may be found in one or both breasts. Signs and symptoms of a breast cyst include:

• A smooth, easily movable round or oval lump that may have smooth edges — which typically, though not always, indicates it's benign
• Nipple discharge that may be clear, yellow, straw colored or dark brown
• Breast pain or tenderness in the area of the breast lump
• An increase in breast lump size and breast tenderness just before your period
• A decrease in breast lump size and resolution of other symptoms after your period

Having breast cysts doesn't increase your risk of breast cancer. But having cysts may make it harder to find new breast lumps or other changes that might need evaluation by your doctor. Your breasts may feel lumpy and painful when you're menstruating, so it's important to be familiar with how your breasts feel throughout your menstrual cycle so that you'll know if something changes.

When to see a doctor

Normal breast tissue often feels lumpy or nodular. But if you feel a new breast lump that doesn't go away, gets bigger or persists after one or two menstrual cycles, see your doctor right away. Also see your doctor if you have new skin changes on one or both of your breasts.